Can you load the other projects in the 4.5 Design Pattern Framework without a problem?
What puzzles me is that your VS goes through a migration.
.NET 4.5 projects are written in VS 2012 and should load immediately in VS 2012.
I suspect it may be target related although the .NET version cannot be specified when loading an existing solution.
Perhaps this link will help: http://msdn.microsoft.com/en-us/library/bb398202.aspx
Hope this helps.
Jack Poorte, Apr 16, 2014